diff --git a/include/stdex/json.hpp b/include/stdex/json.hpp
new file mode 100644
index 000000000..65268af51
--- /dev/null
+++ b/include/stdex/json.hpp
@@ -0,0 +1,100 @@
+/*
+	SPDX-License-Identifier: MIT
+	Copyright © 2025 Amebis
+*/
+
+#pragma once
+
+#include "assert.hpp"
+#include "compat.hpp"
+#include <string>
+
+namespace stdex
+{
+	namespace json
+	{
+		///
+		/// Appends escaped JSON string
+		///
+		/// \param[in,out] dst        String to append to
+		/// \param[in]     src        Source string
+		/// \param[in]     num_chars  Code unit limit in string `src`
+		///
+		template<class TR = std::char_traits<char>, class AX = std::allocator<char>>
+		void escape(
+			_Inout_ std::basic_string<char, TR, AX>& dst,
+			_In_reads_or_z_opt_(num_chars) const char* src, _In_ size_t num_chars = SIZE_MAX)
+		{
+			stdex_assert(src || !num_chars);
+			for (size_t i = 0; i < num_chars && src[i]; ++i) {
+				switch (src[i]) {
+				case '\"': dst += "\\\""; break;
+				case '\\': dst += "\\\\"; break;
+				case '/' : dst += "\\/"; break;
+				case '\b': dst += "\\b"; break;
+				case '\f': dst += "\\f"; break;
+				case '\n': dst += "\\n"; break;
+				case '\r': dst += "\\r"; break;
+				case '\t': dst += "\\t"; break;
+				default: dst += src[i]; break;
+				}
+			}
+		}
+
+		///
+		/// Appends escaped JSON string
+		///
+		/// \param[in,out] dst        String to append to
+		/// \param[in]     src        Source string
+		/// \param[in]     num_chars  Code unit limit in string `src`
+		///
+		template<class TR = std::char_traits<wchar_t>, class AX = std::allocator<wchar_t>>
+		void escape(
+			_Inout_ std::basic_string<wchar_t, TR, AX>& dst,
+			_In_reads_or_z_opt_(num_chars) const wchar_t* src, _In_ size_t num_chars = SIZE_MAX)
+		{
+			stdex_assert(src || !num_chars);
+			for (size_t i = 0; i < num_chars && src[i]; ++i) {
+				switch (src[i]) {
+				case L'\"': dst += L"\\\""; break;
+				case L'\\': dst += L"\\\\"; break;
+				case L'/' : dst += L"\\/"; break;
+				case L'\b': dst += L"\\b"; break;
+				case L'\f': dst += L"\\f"; break;
+				case L'\n': dst += L"\\n"; break;
+				case L'\r': dst += L"\\r"; break;
+				case L'\t': dst += L"\\t"; break;
+				default: dst += src[i]; break;
+				}
+			}
+		}
+
+		///
+		/// Appends escaped JSON string
+		///
+		/// \param[in,out] dst  String to append to
+		/// \param[in]     src  Source string
+		///
+		template<class T, size_t N, class TR = std::char_traits<T>, class AX = std::allocator<T>>
+		void escape(
+			_Inout_ std::basic_string<T, TR, AX>& dst,
+			_In_ const T (&src)[N])
+		{
+			escape(dst, src, N);
+		}
+
+		///
+		/// Appends escaped JSON string
+		///
+		/// \param[in,out] dst  String to append to
+		/// \param[in]     src  Source string
+		///
+		template<class T, class TR_dst = std::char_traits<T>, class AX_dst = std::allocator<T>, class TR_src = std::char_traits<T>, class AX_src = std::allocator<T>>
+		void escape(
+			_Inout_ std::basic_string<T, TR_dst, AX_dst>& dst,
+			_In_ const std::basic_string<T, TR_src, AX_src>& src)
+		{
+			escape(dst, src.data(), src.size());
+		}
+	}
+}
\ No newline at end of file